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Looking at the beatfreq values in the XML source of the preset [1], it's indeed combination of 4 to 11 Hz beats (mostly theta) and 2 Hz (delta).

[1] https://sourceforge.net/projects/gnaural/files/Presets/Minds...

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Oh nice, thanks. I didn't think to check the source. Been thinking to update the app myself though as it's not installing on my current device, and I'd like to explore BBs more. I've also found "Energize", "Problem resolver", "Wakeup", "Rain shower" and "Babbling brook" to be useful. The rest by comparison are pretty meh, or maybe I just didn't find a task match.

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